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kselftest: Extend vDSO selftest

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The current version of the multiarch vDSO selftest verifies only
gettimeofday.

Extend the vDSO selftest to the other library functions:
 - time
 - clock_getres
 - clock_gettime

The extension has been used to verify the unified vdso library on the
supported architectures.

Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Vincenzo Frascino 2020-10-26 11:49:42 +00:00 committed by Shuah Khan
parent 40723419f4
commit 693f5ca08c
3 changed files with 336 additions and 0 deletions
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2
tools/testing/selftests/vDSO/Makefile
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@ -5,6 +5,7 @@ uname_M := $(shell uname -m 2>/dev/null || echo not)
ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
TEST_GEN_PROGS := $(OUTPUT)/vdso_test_gettimeofday $(OUTPUT)/vdso_test_getcpu
TEST_GEN_PROGS += $(OUTPUT)/vdso_test_abi
ifeq ($(ARCH),x86)
TEST_GEN_PROGS += $(OUTPUT)/vdso_standalone_test_x86
endif
@ -18,6 +19,7 @@ endif
all: $(TEST_GEN_PROGS)
$(OUTPUT)/vdso_test_gettimeofday: parse_vdso.c vdso_test_gettimeofday.c
$(OUTPUT)/vdso_test_getcpu: parse_vdso.c vdso_test_getcpu.c
$(OUTPUT)/vdso_test_abi: parse_vdso.c vdso_test_abi.c
$(OUTPUT)/vdso_standalone_test_x86: vdso_standalone_test_x86.c parse_vdso.c
$(CC) $(CFLAGS) $(CFLAGS_vdso_standalone_test_x86) \
vdso_standalone_test_x86.c parse_vdso.c \

90
tools/testing/selftests/vDSO/vdso_config.h Normal file
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@ -0,0 +1,90 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* vdso_config.h: Configuration options for vDSO tests.
* Copyright (c) 2019 Arm Ltd.
*/
#ifndef __VDSO_CONFIG_H__
#define __VDSO_CONFIG_H__
/*
* Each architecture exports its vDSO implementation with different names
* and a different version from the others, so we need to handle it as a
* special case.
*/
#if defined(__arm__)
#define VDSO_VERSION 0
#define VDSO_NAMES 1
#define VDSO_32BIT 1
#elif defined(__aarch64__)
#define VDSO_VERSION 3
#define VDSO_NAMES 0
#elif defined(__powerpc__)
#define VDSO_VERSION 1
#define VDSO_NAMES 0
#define VDSO_32BIT 1
#elif defined(__powerpc64__)
#define VDSO_VERSION 1
#define VDSO_NAMES 0
#elif defined (__s390__)
#define VDSO_VERSION 2
#define VDSO_NAMES 0
#define VDSO_32BIT 1
#elif defined (__s390X__)
#define VDSO_VERSION 2
#define VDSO_NAMES 0
#elif defined(__mips__)
#define VDSO_VERSION 0
#define VDSO_NAMES 1
#define VDSO_32BIT 1
#elif defined(__sparc__)
#define VDSO_VERSION 0
#define VDSO_NAMES 1
#define VDSO_32BIT 1
#elif defined(__i386__)
#define VDSO_VERSION 0
#define VDSO_NAMES 1
#define VDSO_32BIT 1
#elif defined(__x86_64__)
#define VDSO_VERSION 0
#define VDSO_NAMES 1
#elif defined(__riscv__)
#define VDSO_VERSION 5
#define VDSO_NAMES 1
#define VDSO_32BIT 1
#else /* nds32 */
#define VDSO_VERSION 4
#define VDSO_NAMES 1
#define VDSO_32BIT 1
#endif
static const char *versions[6] = {
"LINUX_2.6",
"LINUX_2.6.15",
"LINUX_2.6.29",
"LINUX_2.6.39",
"LINUX_4",
"LINUX_4.15",
};
static const char *names[2][5] = {
{
"__kernel_gettimeofday",
"__kernel_clock_gettime",
"__kernel_time",
"__kernel_clock_getres",
#if defined(VDSO_32BIT)
"__kernel_clock_gettime64",
#endif
},
{
"__vdso_gettimeofday",
"__vdso_clock_gettime",
"__vdso_time",
"__vdso_clock_getres",
#if defined(VDSO_32BIT)
"__vdso_clock_gettime64",
#endif
},
};
#endif /* __VDSO_CONFIG_H__ */

244
tools/testing/selftests/vDSO/vdso_test_abi.c Normal file
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@ -0,0 +1,244 @@
// SPDX-License-Identifier: GPL-2.0
/*
* vdso_full_test.c: Sample code to test all the timers.
* Copyright (c) 2019 Arm Ltd.
*
* Compile with:
* gcc -std=gnu99 vdso_full_test.c parse_vdso.c
*
*/
#include <stdint.h>
#include <elf.h>
#include <stdio.h>
#include <time.h>
#include <sys/auxv.h>
#include <sys/time.h>
#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
#include "../kselftest.h"
#include "vdso_config.h"
extern void *vdso_sym(const char *version, const char *name);
extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
extern void vdso_init_from_auxv(void *auxv);
static const char *version;
static const char **name;
typedef long (*vdso_gettimeofday_t)(struct timeval *tv, struct timezone *tz);
typedef long (*vdso_clock_gettime_t)(clockid_t clk_id, struct timespec *ts);
typedef long (*vdso_clock_getres_t)(clockid_t clk_id, struct timespec *ts);
typedef time_t (*vdso_time_t)(time_t *t);
static int vdso_test_gettimeofday(void)
{
/* Find gettimeofday. */
vdso_gettimeofday_t vdso_gettimeofday =
(vdso_gettimeofday_t)vdso_sym(version, name[0]);
if (!vdso_gettimeofday) {
printf("Could not find %s\n", name[0]);
return KSFT_SKIP;
}
struct timeval tv;
long ret = vdso_gettimeofday(&tv, 0);
if (ret == 0) {
printf("The time is %lld.%06lld\n",
(long long)tv.tv_sec, (long long)tv.tv_usec);
} else {
printf("%s failed\n", name[0]);
return KSFT_FAIL;
}
return KSFT_PASS;
}
static int vdso_test_clock_gettime(clockid_t clk_id)
{
/* Find clock_gettime. */
vdso_clock_gettime_t vdso_clock_gettime =
(vdso_clock_gettime_t)vdso_sym(version, name[1]);
if (!vdso_clock_gettime) {
printf("Could not find %s\n", name[1]);
return KSFT_SKIP;
}
struct timespec ts;
long ret = vdso_clock_gettime(clk_id, &ts);
if (ret == 0) {
printf("The time is %lld.%06lld\n",
(long long)ts.tv_sec, (long long)ts.tv_nsec);
} else {
printf("%s failed\n", name[1]);
return KSFT_FAIL;
}
return KSFT_PASS;
}
static int vdso_test_time(void)
{
/* Find time. */
vdso_time_t vdso_time =
(vdso_time_t)vdso_sym(version, name[2]);
if (!vdso_time) {
printf("Could not find %s\n", name[2]);
return KSFT_SKIP;
}
long ret = vdso_time(NULL);
if (ret > 0) {
printf("The time in hours since January 1, 1970 is %lld\n",
(long long)(ret / 3600));
} else {
printf("%s failed\n", name[2]);
return KSFT_FAIL;
}
return KSFT_PASS;
}
static int vdso_test_clock_getres(clockid_t clk_id)
{
/* Find clock_getres. */
vdso_clock_getres_t vdso_clock_getres =
(vdso_clock_getres_t)vdso_sym(version, name[3]);
if (!vdso_clock_getres) {
printf("Could not find %s\n", name[3]);
return KSFT_SKIP;
}
struct timespec ts, sys_ts;
long ret = vdso_clock_getres(clk_id, &ts);
if (ret == 0) {
printf("The resolution is %lld %lld\n",
(long long)ts.tv_sec, (long long)ts.tv_nsec);
} else {
printf("%s failed\n", name[3]);
return KSFT_FAIL;
}
ret = syscall(SYS_clock_getres, clk_id, &sys_ts);
if ((sys_ts.tv_sec != ts.tv_sec) || (sys_ts.tv_nsec != ts.tv_nsec)) {
printf("%s failed\n", name[3]);
return KSFT_FAIL;
}
return KSFT_PASS;
}
const char *vdso_clock_name[12] = {
"CLOCK_REALTIME",
"CLOCK_MONOTONIC",
"CLOCK_PROCESS_CPUTIME_ID",
"CLOCK_THREAD_CPUTIME_ID",
"CLOCK_MONOTONIC_RAW",
"CLOCK_REALTIME_COARSE",
"CLOCK_MONOTONIC_COARSE",
"CLOCK_BOOTTIME",
"CLOCK_REALTIME_ALARM",
"CLOCK_BOOTTIME_ALARM",
"CLOCK_SGI_CYCLE",
"CLOCK_TAI",
};
/*
* This function calls vdso_test_clock_gettime and vdso_test_clock_getres
* with different values for clock_id.
*/
static inline int vdso_test_clock(clockid_t clock_id)
{
int ret0, ret1;
ret0 = vdso_test_clock_gettime(clock_id);
/* A skipped test is considered passed */
if (ret0 == KSFT_SKIP)
ret0 = KSFT_PASS;
ret1 = vdso_test_clock_getres(clock_id);
/* A skipped test is considered passed */
if (ret1 == KSFT_SKIP)
ret1 = KSFT_PASS;
ret0 += ret1;
printf("clock_id: %s", vdso_clock_name[clock_id]);
if (ret0 > 0)
printf(" [FAIL]\n");
else
printf(" [PASS]\n");
return ret0;
}
int main(int argc, char **argv)
{
unsigned long sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR);
int ret;
if (!sysinfo_ehdr) {
printf("AT_SYSINFO_EHDR is not present!\n");
return KSFT_SKIP;
}
version = versions[VDSO_VERSION];
name = (const char **)&names[VDSO_NAMES];
printf("[vDSO kselftest] VDSO_VERSION: %s\n", version);
vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR));
ret = vdso_test_gettimeofday();
#if _POSIX_TIMERS > 0
#ifdef CLOCK_REALTIME
ret += vdso_test_clock(CLOCK_REALTIME);
#endif
#ifdef CLOCK_BOOTTIME
ret += vdso_test_clock(CLOCK_BOOTTIME);
#endif
#ifdef CLOCK_TAI
ret += vdso_test_clock(CLOCK_TAI);
#endif
#ifdef CLOCK_REALTIME_COARSE
ret += vdso_test_clock(CLOCK_REALTIME_COARSE);
#endif
#ifdef CLOCK_MONOTONIC
ret += vdso_test_clock(CLOCK_MONOTONIC);
#endif
#ifdef CLOCK_MONOTONIC_RAW
ret += vdso_test_clock(CLOCK_MONOTONIC_RAW);
#endif
#ifdef CLOCK_MONOTONIC_COARSE
ret += vdso_test_clock(CLOCK_MONOTONIC_COARSE);
#endif
#endif
ret += vdso_test_time();
if (ret > 0)
return KSFT_FAIL;
return KSFT_PASS;
}